bit depth of 4bit Gif file

Amodio Alessandro <[email protected]> Mon, 08 Jun 2009 17:17:10 +0200

Newsgroups	gmane.comp.video.image-magick.bugs
Message-ID	<[email protected]>

Hi

does it make any sense to detect the real bit depth of grey 4bit Gif  
File (http://rapidshare.com/files/242270859/gif_gray4bit.gif)?

Actually it is detected as a 8bit file.

Thanks,
A.